You know, I actually forgot about Garrelia being a train station, lmao. You're right, that is gone. Though, one year later and all of the people who were working there are still alive. We can probably expect a makeshift or even rebuilt one for CSIII, lol.
Yeah. It takes some liberties, like cramming the Prologue and Chapter 1 together. But, I don't know if it continues on for the rest of the series. There was also a novelization for FC as well. Don't really know much about it, aside from having two volumes.
However, Ring of Judgement is okay. Same artist for the FC manga. I'd imagine you've heard of it or even read it, but it was a cool introduction to Toval and showing of Ein some more. It also ties in with the CSII drama CD. Honestly, I was just in it for the interactions with Toval and Ein. They make for an interesting duo, lol.
Loewe's Monogatari is definitely one that you should look out for! A group has picked it up recently and even translated two chapters already. Shows off Loewe's perspective of FC and SC, even detailing on how he got Kernviter and some of his Ouroboros interactions.
Falcom Gakuen is a funny gag manga as well. It's primarily Kiseki and Ys based, but there is the occasional obscure Falcom title that is the focus sometimes; though, extensive knowledge of them aren't really necessary outside of a cute reference. Also, got an anime, but only the first season was subbed.
I know nothing about the Cold Steel or Zero manga, though, lol. Aside from the former having pretty decent art?
Shedding more light on the novels. Zero was also novelized, and got a bunch of sidestories (like a lot, lol). There was a two volume story on how Nials and Dorothy met. And Cold Steel just got one sidestory volume? I've been contemplating in trying to search for some of them to see if they're any interesting. Mainly the Nials and Dorothy one, though.